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norskMastergradsoppgaver i biologi: Nye registreringer
Viser treff 61-80 av 391
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Food web-mediated interaction between marine mammals and fisheries in the Norwegian and Barents seas.
(Master thesis; Mastergradsoppgave, 2023-05-15)Ecological systems, such as marine ecosystems, are complex adaptive systems in which large scale system properties (e.g., trophic structure, energy flux patterns, etc.) emerge from interactions between ecosystem components or species. This makes them difficult to understand, predict, and model. The Norwegian and Barents Seas support multiple commercial fisheries, including those for herring, cod, ... -
Effect of climate change and invasive species on Arctic marine food-webs
(Master thesis; Mastergradsoppgave, 2023-05-15)Climate warming induces poleward distributional shifts of boreal species in Arctic regions resulting in compositional changes with poorly understood consequences for Arctic food-webs. This thesis addresses the spatial variation in Barents Sea food-webs using previously compiled distributional data in polygons specified for the Nowegian and Barents Sea NoBa Atlantis model and a highly resolved Barents ... -
The effect of endurance training on mitochondrial function in Siberian huskies and Alaskan huskies
(Master thesis; Mastergradsoppgave, 2023-05-15)Teams of Alaskan huskies and Siberian Huskies are used to pull sleds and compete in long-distance races such as Finnmarksløpet (1200 km) and the Iditarod (1600 km). That is an elite athlete performance, and their ability to conduct such extreme endurance challenges under arctic conditions is poorly understood. A previous study has shown that Alaskan huskies possibly have the highest values of ... -
Microplastics Accumulation in Recirculating Aquaculture Systems (RAS)
(Master thesis; Mastergradsoppgave, 2023-05-14)It has in recent years been a shift in the land-based aquaculture production from flow through systems (FTS) to recirculating aquaculture systems (RAS). With emerging use of RAS, it is necessary with knowledge regarding potential issues, whereas one potentially increasing problem is accumulation of microplastics (MP) in the RAS water. The objects of this study were to determine MPs concentration in ... -
Microbial responses to warming and seasonal temperature changes in sub-Arctic forest and grassland soils
(Master thesis; Mastergradsoppgave, 2023-05-15)Atmospheric carbon dioxide (CO2) levels and global temperatures have increased steadily over the past 100 years (IPCC, 2018). Greenhouse gases, such as CO2, and their emissions from soils play an important role in shaping future climate scenarios. Soil microorganisms are responsible for the turnover of soil organic matter and the release of CO2 to the atmosphere (Hartley et al., 2008), thereby ... -
The Suprachiasmatic Nucleus of The Reindeer (Rangifer tarandus tarandus) and it’s Circadian Outputs
(Master thesis; Mastergradsoppgave, 2023-05-14)The Earth is in constant movement around the Sun – this has created environments with changing light throughout the day and year. Through evolution animals have adapted to this change in light and circadian and circannual rhythms have evolved to enhance fitness and survival. Animals living in the Arctic region have a different relationship to light changes as for several months a year the Sun ... -
Biotic and abiotic drivers of barnacle recruitment along a sub-Arctic intertidal rocky shore
(Master thesis; Mastergradsoppgave, 2023-05-15)Most marine ecological research in the Arctic has focused on open water ecosystems, while coastal ecosystems are systematically under-studied. However, Arctic near-shore ecosystems are highly stressed environments and play a major role in biogeochemical cycling (e.g., nutrient input from thawing permafrost). Furthermore, the Arctic region has extreme environmental conditions which are expected ... -
Circannual rhythms in Arctic charr (Salvelinus alpinus)
(Master thesis; Mastergradsoppgave, 2023-05-15)The Arctic charr (Salvelinus alpinus) is a true arctic species and is considered to be the northernmost freshwater fish. Since this species is being known for its great variability in size, phenotype, colour, ecology and history, some of them are landlocked (which stay in freshwater all their life) and others are anadromous (they undertake summer migrations to sea and then they come back to ... -
Changes in the distribution of marine invertebrates in a warming Barents Sea over the last century
(Master thesis; Mastergradsoppgave, 2023-05-14)The Barents Sea is a shelf sea in the European Arctic and is influenced by the North Atlantic Current and the Arctic Ocean. The North Atlantic Current is composed of warmer, saline waters compared to the cold, fresher waters from the Arctic Ocean. Over the last century, the Barents Sea mean temperature has increased by 1.5°C above a depth of 60m and by 0.5-0.8°C below 60m. This warming is ... -
Developing a mitigation hierarchy framework to conserve wetland biodiversity under pressure from development
(Master thesis; Mastergradsoppgave, 2023-05-16)Wetlands are severely affected by human development. About 50 % of their original global extent has been lost, their populations of plants and animals have declined faster than for any other ecosystem, and 25 % of wetland-dependent species are threatened. As the main reason for these declines is habitat loss, often caused by infrastructure development, it is critical to develop conservation strategies ... -
Beyond Catching Fish: Exploring the role of Relational Values in Mobilizing Community-based Management Efforts in a north Norwegian lake
(Master thesis; Mastergradsoppgave, 2023-05-15)All over the world, local communities are actively engaging in the management and monitoring of natural resources. The underlying driver of most community-driven efforts goes beyond the direct utilization of natural resources to entail a deeper relation to the place or ecosystem they are managing. Relational values have been suggested as a potential driver of such initiatives, but empirical research ... -
Size composition, reproductive investment, and fecundity of red king crab (Paralithodes camtschaticus) in Finnmark fjords, 1994-2022
(Master thesis; Mastergradsoppgave, 2023-05-15)The release of red king crab (Paralithodes camtschaticus) into the Barents Sea by Russian scientists in the 1960s had the goal of establishing a self-sustaining stock for the purpose of commercial harvest. The red king crab has been successfully established as a stock in Norwegian waters where it has become an important commercial resource in the eastern regions of Finnmark. The Norwegian red king ... -
Morphological variation in the redfish (Sebastes spp.) complex in Norwegian waters
(Master thesis; Mastergradsoppgave, 2021-06-02)The golden redfish Sebastes norvegicus is a long-lived commercial species of redfish in the North Atlantic. Excessive harvest through decades has led to a decline in the mature population in Norwegian waters, which is currently considered to be severely depleted. Accumulating genetic evidence suggest a more complex structure within the Sebastes genus in the North Atlantic, which has recently formed ... -
Inflammatory responses in lumpfish (Cyclopterus lumpus L.) vaccinated at different water temperatures with intraperitoneal injection
(Master thesis; Mastergradsoppgave, 2021-05-18)The use of lumpfish (Cyclopterus lumpus L.) as cleaner fish in salmonid aquaculture for the biological control of sea lice infestation levels has increased in recent years. The species is relatively new to aquaculture and susceptible to various infectious agents. The health situation for lumpfish is currently considered poor, indicating the necessity for developing more efficient vaccines. Studying ... -
Plastic occurrence in six different species of Arctic seabirds - Harmonizing methods and closing knowledge gaps on plastic occurrence and polymer identity
(Master thesis; Mastergradsoppgave, 2021-05-18)The once pristine Arctic is now facing negative alterations with a rapidly changing climate, increasing human activity, and plastic pollution. Seabirds are intrinsic to the marine ecosystems, and in recent years, plastic ingestion by seabirds has been of increasing concern because of the potential negative impact on individual and population levels. The aim of this study was to investigate the plastic ... -
Snow depth effects on vegetation dynamics and development of near-remote sensing techniques in high-Arctic tundra
(Master thesis; Mastergradsoppgave, 2022-05-16)Snow exerts key controls on many aspects of plant ecology in the Arctic, including community composition. With climate predictions forecasting dramatic changes in winter climate and snow cover in the Arctic in the near future, it is important to improve our understanding of snow effects on plant communities in these regions. This study used a snow depth manipulation experiment established in 2006 ... -
Timing is everything: Within-plant flowering phenology impacts fruit production in the Arctic-Alpine cushion plant Silene acaulis (L.) Jacq.
(Master thesis; Mastergradsoppgave, 2022-05-16)Timing is everything for Arctic flowering plants. Early flowers might be destroyed by frost, while late flowers have less time and resources to mature fruit. With climate change, Arctic flowering phenology is shifting. Yet for many species, phenology studies only encompass the onset of flowering and lack baseline data on within-plant flowering times. I used the gynodioecious cushion plant Silene ... -
Effect of simulated disturbance by geese on soil temperature and active layer thickness over one growing season
(Master thesis; Mastergradsoppgave, 2022-05-13)The Arctic is an area predicted to be strongly affected by climate change, and the extent of permafrost is expected to decrease. The insulating capacity of bryophytes is central in permafrost preservation. In High-Arctic Svalbard, disturbance by geese through grubbing may damage and remove parts of the bryophyte layer in moss tundra. The disruption is expected to lead to increased soil temperatures ... -
Spatiotemporal distribution and co-occurrence of Arctic herbivores in spring
(Master thesis; Mastergradsoppgave, 2022-04-19)Biotic interactions play an important role in the structure and dynamics of food-webs and may drive the spatial distribution of species. In the Arctic, spring snow-cover limits the availability of resources at a critical time for resident and migratory herbivores, which could lead to resource competition. This study takes a first step towards understanding the potential for competition between the ... -
Lipids and diapause in Calanus spp. in a high-Arctic fjord: state-dependent strategies? Tracking lipids through the polar night
(Master thesis; Mastergradsoppgave, 2010-11-15)Calanus copepods C. finmarchicus, C. glacialis and C. hyperboreus are keystone species in the Arctic marine ecosystem, constituting 70-90% of the zooplankton biomass. In high latitudes, the growing season is short and unpredictable, and the winter long and unproductive. These species have adapted flexible life histories, lipid accumulation, and a state of deep-water diapause to survive. Winter ...
